I believe Caty's post #1 is still correct and I didn't think gmapsup1.img was made available on sd card by any recent fw, and so still only gmasupp.img in sd Garmin folder for zumos including 660.
@Beddhist
Easy way to check what map name/paths are available, look at your Inventory page and compare to what's posted by fiat_lux for his 550 in the post above yours to get the correct map naming conventions. If gmapsup2.img doesn't work, try gmapprom1.img.
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